The hand of an artist!! If you posted that big enough, I'd use it as a background for my Desktop!! It's kind of awesome, those heads on a nice looking hand, incredible juxtaposition!
I can work with .Obj and .stl files directly, if you ever wanted to share ideas. I can export to those formats as well.
Get away from using tabs and make the lines on the face glue edge to edge, use a glued up strip of paper on the backside, and the face will not only smooth out incredibly, but if you use a glue like "ZIP DRY", you will be able to go go in there with a round object and smooth on the heads and give them a more organic feel. You can glue glass to leather with this stuff, and it's non toxic and lignin free (will not yellow). I get if from Micheal's Craft Stores. Not sure where you are from, but their all over the U.S.. My 2 cents worth.